To determine the specific version of your MacBook:
- Turn your MacBook on.
- Click on the Apple icon in the top left corner of your screen.
- Click on "About This Mac".
- The box that pops up will tell you the specifics of your MacBook.
Note that the physical size of your MacBook is not the same as the size in the name. For example, a 16-inch MacBook Pro measures 14.09" x 9.68". This is because laptop computers are measured diagonally across the screen - not straight across, and not including the border, case, et cetera - just like a television.